Actually, it's just that I'm too idle, so I'm idle and cranky. I need to find more things to do for myself and keep myself busy.

You can study, whether in high school or college, and you should not forget your study. You can also find a part-time job, which can not only kill boring time, but also earn a little money for yourself and reduce the burden on your family. You can also take part in some activities, experience yourself and cultivate your hobbies.